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ar-15 exploded

This is a discussion on ar-15 exploded within the M16 AR15 forums, part of the Rifle Forum category; Originally Posted by Hgunner If you know the AR design a whole lot would have to go wrong to cause an out of battery firing. ...


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Old January 8th, 2017, 07:38 AM   #31
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Originally Posted by Hgunner View Post
If you know the AR design a whole lot would have to go wrong to cause an out of battery firing.
This is not true. A high primer, or an overly sensitive primer can cause a out of battery firing.

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Old January 8th, 2017, 08:04 AM   #32
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My goto with AR kabooms is out of battery. The weak point in the design is the free float firing pin. It requires a person to keep it clean and properly floating. Still it can take a fair amount of abuse before it malfunctions. I have fired four to five hundred rounds out of an AR before cleaning and had no problems. A high primer is not going to help things and the wrong powder can also cause problems. Likely not a double charge of the proper powder because there really isnt room in the case for a double. BTW our beloved M14/M1A can suffer from an out of battery kaboom due to a sticking FP.

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Old January 8th, 2017, 08:40 AM   #33
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We spent the whole ride home in the camper trying to figure that out. Best as we can tell it was an out of battery detonation.
Again, doubt seriously if this was a out of battery detonation.

You do realise that on a properly working AR that the firing pin cannot reach the primer until the bolt closes and rotates into battery.

I doubt a out of battery detonation would do that kind of damage.

I would be looking at ammo.

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Old January 8th, 2017, 08:57 AM   #34
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Again, doubt seriously if this was a out of battery detonation.

You do realise that on a properly working AR that the firing pin cannot reach the primer until the bolt closes and rotates into battery.

I doubt a out of battery detonation would do that kind of damage.

I would be looking at ammo.
I am pretty sure this ine wasn't working properly.

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Old January 8th, 2017, 10:08 AM   #35
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Originally Posted by lysander View Post
This is not true. A high primer, or an overly sensitive primer can cause a out of battery firing.
A high primer thats a maybe, I would suspect the bolt would be partial closed and not cause this kind of damage.

A sensitive primer more that likely a slam fire with the bolt fully closed.

Most of the time when I see these (slam fire) its not a sensitive primer it a faulty fire control group and there is no damage to the gun.

The way the Bolt and BCG is designed the firing pin cannot reach a primer until the bolt locking lugs are into the barrel lugs and the bolt is rotating into place, and it darn near has to be full locked.

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Old January 8th, 2017, 11:21 AM   #36
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Originally Posted by Hgunner View Post
Again, doubt seriously if this was a out of battery detonation.

You do realise that on a properly working AR that the firing pin cannot reach the primer until the bolt closes and rotates into battery.

I doubt a out of battery detonation would do that kind of damage.

I would be looking at ammo.
The reason we are going with out of battery detonation is because if the gun had been locked up when the explosion occurred the bullet would have traveled further down the barrel. All of the force of the explosion went to the rear, if the lugs have been locked at least some of the force would have been exerted on to the bullet moving it down the barrel further than half an inch past the throat. Also there was no sign of any damage to the lugs on the bolt meaning that they never were engaged. With that kind of force there should have been at least some galling on the backside of the lugs if the gun was locked up when it went off.

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Old January 8th, 2017, 12:28 PM   #37
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You need to go pull an ar bcg a see how it works.

Operate it by hand and see when the firing pin protrudes enough to ignite a primer.

Looking at the pic I do see lug damage and missing half an extrator missing.

Sure would like to a better picture of what is left of the case.

Also what kind of ammo was used.

Wasn't Perfecta was it.

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Old January 8th, 2017, 04:24 PM   #38
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Although I am not a fan of Plastic I think we all agree it was either Ammo or an out of battery thing! I don't believe it was the AR design per say. Either way it makes you think about what happens when a round blows unsupported.

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Old January 8th, 2017, 05:16 PM   #39
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Hot round is my wager. That bolt took a beating. An aluminum lower would have given up the ghost, just slightly less dramatic.

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Old January 8th, 2017, 05:18 PM   #40
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Originally Posted by Hgunner View Post
You need to go pull an ar bcg a see how it works.

Operate it by hand and see when the firing pin protrudes enough to ignite a primer.

Looking at the pic I do see lug damage and missing half an extrator missing.

Sure would like to a better picture of what is left of the case.

Also what kind of ammo was used.

Wasn't Perfecta was it.
Hgunner I am not talking about the explosion in this picture I am talking about the one that my friend had.

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Old January 8th, 2017, 06:42 PM   #41
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Originally Posted by Hgunner View Post
Sure would like to a better picture of what is left of the case.
Here you go:



Looks like a hot round.

Given the damage to the upper, the material the lower was made from wouldn't have made any difference, it would have been ruined.

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Old January 8th, 2017, 07:26 PM   #42
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I think bad ammunition. What is left of the primer shows what looks like a normal dimple from a firing pin strike. That means the bolt had to be locked in to battery. The size of the flash hole is awfully large. If that was caused by the gas blow by then the round must have been an incredibly hot load. Wonder what kind of powder was in it.

I have about a dozen scars on my arms from a guy that blew up a Thompson Contender in 44 special next to me. He said he was using 25 grains of 2400. I told he that was way to hot but he said the guns would handle the load with no problem. I don't even remember him firing it. Next thing I remember was leaning against the railing behind me with several pieces of wood sticking in my arms and my sinus's ruptured. Not satisfied with destroying one gun, he picked up a second Contender and proceeded to blow that one up also. My only thought is he must have loaded the rounds with Bullseye.

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Old January 8th, 2017, 11:28 PM   #43
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The AR has always always been and will always be a mattel toy.
Couldn't of said it better myself. Keep on keepin on!

Plastic doesn't have anything on some good ol Classic American Steel!

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Old January 9th, 2017, 10:28 AM   #44
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Couldn't of said it better myself. Keep on keepin on!

Plastic doesn't have anything on some good ol Classic American Steel!
Ha! That's funny. My new M1A Scout with a plastic stock probably has more plastic on it than any of the AR type rifles I own.

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